Agatha Christie's "The Mousetrap" is the longest running show, of any kind, in the world. It opened Nov. 25, 1952 at the Ambassadors Theatre in London and is still running. The second longest "play" appears to be the one we are seeing with increased frequency in Washington. Call it the government shutdown. It's less entertaining and costs far more to watch than a ticket to Christie's whodunnit.

Source: The Second Longest 'Play'